Chromiferous dyestuffs and processes of preparing them



Patented July 4, 1939 UNITED STATES CHROMIFEROUS DYESTUFFS AND PROC- ESSES F PREPARING THEM Wilhelm Eckert, Frankfort-on-the-Main-Hochst, Germany, assignor to General Aniline Works, Inc., New York, N. Y., a corporation of Dela- Ware No Drawing. Application October 8, 1935, Se-

rial No. 44,127.

Claims.

SO2OH NHz wherein R means the radical of an ortho-hydroXy-carboxylic acid of the benzene series.

The chromiferous dyestuffs which are obtainable according to the present invention possess, besides a very clear greenish-yellow shade, good fastness to washing, fulling, perspiration, sea water and light, and thereby fulfil a technical requirement.

The dyestuffs may be transformed into chromiferous dyestuifs in known manner by a treatment, for instance, with chromium formate or chromium acetate, chromium fluoride, chromic chloride or the like, by boiling in a reflux apparatus or under pressure.

The following examples illustrate the invention, but they are not intended to limit it thereto, the parts being by Weight:

1. 50 parts of the dyestuff of the following constitution:

Cl CO OH are suspended in 500 parts of water, the reaction In Germany October 11, 1934 chromium formate (corresponding with 16 parts of chromium oxide) is added and the whole is boiled for several hours. The dyestuff dissolves gradually with formation of its chromium compound. When the reaction is finished, the dyestuff is isolated in the usual manner, filtered by suction and dried. It forms a yellow powder which is easily soluble in water and yields, for instance on wool, according to the method usually applied with chromiferous dyestuffs, greenishyellow dyeings of good fastness to washing, fulling, perspiration, sea-water and light.

2. By substituting for the dyestuff used in Example 1 the same amount of the dyestufi of the following constitution:

SOaH COOH there is obtained a dyestuif of similar fastness and other properties.

3. 50 parts of the dyestuff of the following constitution:

OOOH

are dissolved in water and sodium carbonate, the sodium salt of the dyestuff being obtained. A solution of chromium fluoride, corresponding with 16 parts of chromium oxide, is added thereto and the whole is heated to boiling until it has become a clear solution. The solution is then evaporated to dryness. A greenish-yellow powder is obtained which yields dyeings of the same fastness and other properties as those of the dyestuff obtained as described in Example 1.

4. By substituting other dyestuffs for those "used in the above example; for instance, the dye- .stufis of the following constitution:

ings of good fastness to washing, fulling, perspiration, sea-water and light.

3. The chromium complex compound of the SO3H\ COOH HaC-OO-HN OOOH formula:

Filo-ms /GOOH I 011 I OH OH oo oo N oo 00 --Or there are obtained chromium compounds of similar properties. The conditions of chroming may also be varied; thus, for instance, the chromium salts specified may be exchanged for other inorganic or organic chromium salts and there may be applied a reduced pressure.

The dyestuifs are distinguished not only by their shades and the fastness properties of their valuable as pigment dyes.

I claim:

general formula:

being a powder which is easily soluble in water and yields on wool greenish-yellow dyeings of good fastness to Washing, fulling, perspiration, sea-water and light.

4. The chromium complex compound of the formula:

dyeings on animal fibers but they are also very 1. The chromium complex compounds of the oo 00 Cr OH x N --s 0,011 oo oo 01' I X NH: J

being a greenish-yellow powder which is easily I soluble in water and yields on wool greenishyellow dyeings of good fastness to washing, fully ing, perspiration, sea-water and light.

H, 5. The chromium complex compounds of the wherein Y is a member of the group consisting general formula:

of hydrogen, chlorine, sulfonic acid and acetyl- Y COOH amino.

2. The chromium complex compound of the formula: OH

o1 OOOH N wherein Y is a member of the group consisting of hydrogen, chlorine, sulfonic acid and acetylamino and X is a member of the group consisting of hydrogen and SOzOI-I.

being a yellow powder which is easily soluble in water and yields on wool greenish-yellow dye- WILHELM ECKERT. 

